Having been a hold-out for a long time, I’m thinking it would actually be smart to use the vault. Question: Is there a way get all my fonts into the vault (all 5479 of them) without having to first delete and remake my beautifully organized sets?
Do you have the Add fonts leaving them in place option checked in your preferences?
Because if you don’t, your fonts and sets are already in the vault.
You would have to remove all the fonts that you added ‘in place’ and add them again with it set to add fonts into the vault. To keep the sets, simply make sure that you File > Export Sets before you begin, so that you can then File > Import Sets once the fonts are added once more into the vault-based library.